Technical data
70
If it should become necessary to add water to the plant and, if required, to the water
in the plant (free of impurities) glycol antifreeze of the inhibited monoethylene type,
for the correct execution of these procedures, proceed as described in Paragraph 4.6
FILLING THE SYSTEM CIRCUIT (APPLIANCE) → 32.
6.3 CHANGE OF GAS TYPE
The following procedure must be done by a Robur TAC or professionally qualied
technician.
To convert the appliance to operation with a dierent type of gas from that indica-
ted on the sticker on the appliance's internal panel and the packaging, proceed as
follows.
You will need: appliance not powered up: master power switch and gas cock set to
OFF. provided envelope containing the spare nozzles and sticker. Necessary equip-
ment and materials.
The appliance must be tted with the sticker (in the conversion kit) giving the speci-
cations of the new gas type in replacement of the existing sticker. The sticker must
bear the markings required by UNI EN 483 (par. 8.2.3).
- CHECK THE NOZZLE DIAMETER.
Refer to Table 6.1 Gas type identication values → 67 and Figure 6.3 Gas type con-
version → 73; if the diameter of the nozzle to be used with the gas with which the
appliance is to be operated corresponds to the diameter of the existing nozzle, skip
directly to the step checking the value of parameter "45": step "8" onwards.
If on the other hand the diameter is dierent from that of the existing nozzle, the latter
must be replaced:
Remove the outer front panel (H - Figure 6.1 Checking and adjusting the combu-1.
stion parameters → 66) and open the internal panel (E - Figure 6.1 Checking and
adjusting the combustion parameters → 66) by undoing the screws securing it.
Undo the nut (A) connecting the gas pipe to the gas valve (C).2.
Slacken o the nut (B) connecting the gas pipe to the air/gas mixer (G).3.
Turn the gas pipe so as to enable access to the gas nozzle (D) inside the anged 4.
union on the gas valve outlet (C).
Replace the nozzle (D).5.
Each nozzle is stamped with a code to identify it (see Table 6.1 Gas type identication
values → 67).
Restore the appliance making sure to reposition (and replace if damaged) the 6.
gaskets (E, F) aected by the procedure.
During the procedure a number of broken seals must be restored and regulators
sealed.
At this point, open the system gas cock and check for gas leaks at the two pipe unions
(A, B); close the gas cock.
Close the appliance's internal panel (E).7.